#include<iostream>
#include<vector>

using namespace std;

int main()
{
	vector<int> i;
	vector<int> j (10,0) ;
	string cut("hehe");
	for (auto ch : j)
	{
		cout << ch << " ";
	}
	j.insert(j.begin(),3);
	cout << endl;
	for (auto ch : j)
	{
		cout << ch << " ";
	}
	cout << endl;
	j.swap(i);
	for (auto ch : i)
	{
		cout << ch << " ";
	}
	cout << endl;
	//vector<vector<int>>;
	return 0;
}